Move pages under tldr, lint run.sh, update docs

tldr/pg_dump

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# pg_dump
+
+> Extract a PostgreSQL database into a script file or other archive file.
+> More information: <https://www.postgresql.org/docs/current/app-pgdump.html>.
+
+- Dump database into an SQL-script file:
+
+`pg_dump {{db_name}} > {{output_file.sql}}`
+
+- Same as above, customize username:
+
+`pg_dump -U {{username}} {{db_name}} > {{output_file.sql}}`
+
+- Same as above, customize host and port:
+
+`pg_dump -h {{host}} -p {{port}} {{db_name}} > {{output_file.sql}}`
+
+- Dump a database into a custom-format archive file:
+
+`pg_dump -Fc {{db_name}} > {{output_file.dump}}`
+
+- Dump only database data into an SQL-script file:
+
+`pg_dump -a {{db_name}} > {{path/to/output_file.sql}}`
+
+- Dump only schema (data definitions) into an SQL-script file:
+
+`pg_dump -s {{db_name}} > {{path/to/output_file.sql}}`